
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>简易网页时钟</title>
<style>
body,div{margin:0;padding:0;}
/* \u5fae\u8f6f\u96c5\u9ed1:汉字字体的unicode码，以16位编码; 此处为微软雅黑 */
body{color:#fff;font:16px/1.5 \u5fae\u8f6f\u96c5\u9ed1;}
#clock{width:300px;text-align:center;background:#1a1a1a;margin:10px auto;padding:20px 0;}
span{color:#000;width:80px;line-height:2em;background:#fbfbfb;border:2px solid #b4b4b4;margin:0 10px;padding:0 10px;}
</style>
<script>
window.onload = function ()
{
	var oClock = document.getElementById("clock");	
	var aSpan = oClock.getElementsByTagName("span");
		
	setInterval(getTimes, 1000);
	getTimes();
	function getTimes ()
	{
		var oDate = new Date();
		var aDate = [oDate.getHours(), oDate.getMinutes(), oDate.getSeconds()];
		for (var i in aDate) aSpan[i].innerHTML = format(aDate[i])
	}
	function format(a)
	{
		/* ^(\d)$匹配0-9的单个数字，从开头到结束都是单数字。*/
		return a.toString().replace(/^(\d)$/, "0$1")
	}
}
</script>
</head>
<body>
<div id="clock">
	<span></span>点<span></span>分<span></span>秒
</div>
</body>
</html>
